Update readme.md (Azure#17257)

Author: msyyc

specification/operationalinsights/resource-manager/readme.md

@@ -34,7 +34,7 @@ title: LogAnalyticsManagementClient
 ``` yaml
 description: Operational Insights Client
 openapi-type: arm
-tag: package-2021-06
+tag: package-2021-12-01-preview
 ```